Research On Growth Traits And Herbal Quality Of Astragalus Membranaceus By Seed Coated

Astragalus membranceus(Fisch) Bge is a perennial legume,whose root is a common nourishing herbal medicine.Astragalus has used in China as a medicine for several thousand years,with in-depth study,the range of its applications is more and more wide.However, due to long-term over-excavation,the wild Astragalus resources are dwindling,cultivation became a major source.The artificial cultivation exist so much practical problems,such as the low germinate rate,high seed rate,insect pests and plant diseases prevalent,difficult to grasp the whole seedlings and reduction in serious condition.To keep the agronomic traits and solve the main problems in cultivation,a seed-coating agent was successfully developed.In the already study,the basic physical and chemical characters were assayed and the related technologies were also researched.The results show that it could inhibite epiphyte and root rotten illness,increase the ratio of seedling emergence, improve of the root activity,enhance Astragalus's seedling resistance and seedling index. Astragalus-coated agent can also improve of root thickness and main root volume,make the dry weight of main root and the main active component content increasese.In this paper,we take full account of the characteristics that the cultivation period of medicinal herbs Astragalus in general at least two years,only after two years it could be harvested to use in medicine.On the foundation of the above study,we have a next research on two year old Astragalus about the change of biological yield and the main active component content.To verify the duration of pharmaceutical and micro-fertilizer in Astragalus-coated agent and their impact on the quality of Astragalus.The double controls of seed coated with ND general seed coating(8%of seed dry weight) and seed uncoated.The results indicate that:Compared with CK of the same dose,deal with Astragalus seed coating could increasing in biological yield,improvement of the main active component content,so optimizes Astragalus's quality.Conclusion remark of this thesis:1.The research on biological yield of different seed coating units indicate: Astragalus-coated agent can improve root thickness and main root volume,thereby,the dry weight of main root could also be increasesed.meanwhile,the results also show that the promotion of the Astragalus-coated agent to the aboveground biomass better than to the underground biomass.Compare to ND-coated agent of the same concentration,it is significant on the growth of the aboveground biomass by Astragalus seed coating agent.2.The research on biological character of different seed coating units indicate: Astragalus seed-coated agent can shorten the lengh of Astragalus's roots,increase coarse root,increase the volume and dry weight of main root and leteral root,while,through Multiple comparisons showed that the impact to the volume and dry weight of leteral root is not significant when used low concentration,which means that it has little effect on the establishment of the good shape of Astragalus.Commpared with ND-coated agent of the same concentration,Astragalus-coated agent has advantage on the increase of coarse root and root volume.3.Astragalus-coating agent can improve of the main active component content, optimizes Astragalus's quality,advance medicine value,decrease pesticide residue.4.The investigation to the Astragalus of the same disposal and different cull month indicate:in sprouting stage and dormancy stage the main active component content is more higher,which is coincide with traditional condition.5.The investigation to the compare of the increase of the underground biological character and the biological yield between the two years indicate:the impact of the Astragalus-coating agent to biological character index in the second year is inferior to the first year,but still play action to the increase of the biological character.6.Astragalus seed-coat agent has reached national standard in its physical and chemical characters and possesses the advantages of low poison,low remain,low pollution,pathogen inhibition.It could inhibite epiphyte and root rotten illness.compared with ND general seed coating in same dose,Astragalus seed-coat agent have more superiorities.The amount of seed-coated agent to be applied better to be used is 4%of the seed dry weight.